Now that you have a coinbase account, switch from coinbase to GDAX for _significantly_ lower fees (about a tenth of what coinbase charges or even free if you use 'post only' limit trades) and more sophisticated control of your trades. They're the same company, so you'll be able to use your coinbase login at GDAX and transfer your funds instantly for free between the two.
Coinbase and GDAX are limited to a handful of blue chip coins (BTC,ETH,LTC at this time). As for Bittrex -- it's an exchange used mostly for trading alternative coins and it doesn't support fiat as a means of funding your account, so if you want to buy alt coins, you'll want to buy BTC (or ETH) on GDAX, then withdraw that to your Bittrex account to fund it and start trading currency pairs.
Enjoy the ride.
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That's a little confusing but Im sort of following you. So GDAX I can't buy with my bank account or whatever but if I have an account of alt coins then I can purchase from there using them?
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